2002 F150 starting issue

When placing the vehicle in park, turning off and taking the key out, the radio, heating/cooling system and dash lights stay on. When this happens I cannot restart my truck. In order to restart the truck, I need to disconnect and reconnect the battery cables.

This is a strange one. All the ymptoms point to a bad ignition switch (not lock cylinder) except for the dash lights staying on.
The radio, heater/a/c go through the ignition switch but the dash lights do not.
which dash lights are on? Illumination?

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? 10:56https://www.youtube.com/watch?v=-XjXTVJhFLM
Nov 21, 2014 - Uploaded by ChrisFix
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Check the connections at the battery. Loose connections or corroded connections will cause this same symptom.

It is not uncommon for side terminal batteries to also have a problem internally between the mounting button (the place that the cable end bolts to) and the internal connection to the battery.

What sounds like what is happening is the connection is good enough to power up a light load, dash lights, gauges, radio, etc, but when a heavy load is demanded the connection heats up and looses continuity.

I see this issue more on fords but I have seen a fair amount of GM's with this issue.

chk your key is it clean and did you unplug your pats module under the colume or is there a module behind cluster near radio and you didnt plug it in the light is on because the security system is on and you did not disable it by putting key in the swtch this should disable the system or a fuse could be burnt as well are you sure the dash is exactly the same year there could be different fetures

If this is running for a few minutes after shut down, this is normal. If it continues to run long after that there is an issue with the CTS (Coolant Temperature Sensor) circuit or its controlling relay.